Mining-machine chain



C. L. KENTON.

MINING MACHINE CHAIN.

APPLICATION HLED MAY3,1920.

LQEQSQQO Patented Nov. M, 1922.

R [N VENTOR I TTORNL'Y Patented Nov: 14, 1922.

UNITED.

PATENT OFFICE.

CLYDE L. KENTON, OF COLUMBUS, OHIO, ASSIGNOR TO THE EFFREY MANUFACTURING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

MINING-MACHINE CHAIN.

Application filed May 3, 1920. Serial No. 378,518;

To aillwhomitmay concern:

Be it known that I, CLYDE L. KENTON, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and. useful Improvements in Mining-Machine Chains, of which the following is a specification, reference being had therein to the accompanying drawing.

The present invention relates to certain new and useful improvements in cutter chains" for coal -mining and other similar machines.

The especial object of this invention is to provide a chain of strong and simple construction comprising means for securely holding the renewable cutter bits during operation of the machine which will permit of expeditious and convenient replacement and adjustment of said bits.

The means by which I attain this object are fully set forth in the following specification and illustrated in the accompanying drawings of which Fig. '1 is a side elevation of a portion of a chain embodying my invention.

Fig. 2 is a plan view of the links shown Fig. 1. l

Fig. 3 is a longitudinal section taken along the line III-III of Fig. 2.

Like numerals refer to similar parts in the several figures.

\ In the mining of coal, as commonly practiced,kerfs are cut in the coal body to permit a sufficient distortion of the material adjacent said kerfs to dislodge fragments for transportation from the mine. The ma-. chines most commonlyused for the formation of said kerfs are provided with cutting tools removably attached to suitable chains by the movement of which said [tools are forced into the coal to cut it. Tools so used the cutter bits to mining machine chains which, while securely-holding them in correct position' during operation, will permit theirquick and easy replacement and adjustnient. However all such devices with i which I am familiar possess certain inherent defects which it is the object of the present invention to overcome.

In the drawings I have illustrated a mining\ machine chain composed of a series of block links 1 connected-by strap links 2 and pintles 3. The block links 1 are extended upwardly to form sockets 4 adapted to hold the cutter bits 5 in operative position in the manner well understood. in the mining machine art. The cutter bits 5 are preferably straight pieces cut from steel bars of rectangular cross sections, the cut ends of which are inclined to produce the cutting edges 6, one at each end of the bit. The bits 5 are longitudinally slidable in apertures 7 of the sockets 4, which are proportioned to form a snug sliding fit adapted to hold the bits against angular displacement whlle permitting their convenient longitudinal adjustment. Formed in the upper part of the socket 4 is a slot 8 extending longitudinally of the link rearwardly from the aperture 7, and in this slot is mounted a rip jaw 9 adapted to rotation about its fu crum pin 10. Formed integral with the jaw 9 is a re'arwardly extending lever 11 which is pierced near its free end by a set screw 12 the point of which engages the 'upper surface of the block links 1. When the set screw 12 is screwed downwardly against the surface of the link the lever 11 is forced upwardly to press the jaw 9 into engagement 'with the cutter bits 5 to clamp it against longitudinal movement. Formed on the contacting face of the jaw 9 are teeth 13 adapted to bite into -of the lever arm 11 to withdraw the teeth set screw 12 may be again tightened to cause the jaw 9 to engage and securely clamp the bit in the desired position. The

location and direction of the set screw 12' to rotate the.

rendersit readily accessible in all positions jaw formed on one arm of said lever, and

of the cutter chain, and the proportion of, the lever 11 to the jaw 9' permits great clamping pressure tobe applied to the bits without subjecting the set screw to excessive strains.

- What ll claim is:. v

1. In a cutter chain for mining machines, the combination with a block link having a transversely extending aperture, a cutter bit longitudinally movable in said aperture, a rotatable gripping device arranged to engage the bit to hold; it against movement relative to the link, and a screw arranged gripping device into bit en; gaging position.

g 2. In a cutter chain for mining machines, the combination With a block link having a transversely extending aperture, a cutter bit longitudinally movable in-the aperture,

a lever fulcrumed adjacent the aperture, a

memos a screw engaging the other arm of the lever to move the jaw into contact with said bit to holld it against movement relative to said 3. In a cutter chain for mining machines, the combination with a block link having a transversely extending aperture,- a cutter bit longitudinally n ovable' in the aperture, a screw adapted to secure said bit against movement relative to said link, and a lever interposed between said bit and said screw to multiply the eliective pressure of the screw upon the bit.

In testiniony whereof, I afiix -my signa-- ture, in the presence oftwo witnesses. CLYDE L. Knnron.

Witnesses:

HARRY C. DEAN, ANNA .M, FENLoN. 

